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When a stripped plastic gear or an imprecise drive ratio derails your build, you need a metal replacement you can count on. These Module 1.0 spur gear pinion gears are designed for hobbyists, robotics builders, CNC enthusiasts, and small-machine engineers who demand consistent tooth geometry and reliable torque transfer without sourcing custom parts.
Each gear is machined from #45 carbon steel, offering a solid balance of hardness and machinability. The module (pitch) is 1.0 mm, meaning the tooth pitch diameter equals the tooth count in millimeters — a 20T gear has a 20 mm pitch diameter, a 40T gear has a 40 mm pitch diameter, and so on. The bore diameter and hub dimensions vary by tooth count; refer to variant options for exact measurements. The full range spans 12 teeth to 140 teeth, covering a wide spread of gear ratios in a single product family.
Typical use cases include: direct-drive motor pinions for DC gear motors in robotics and automation rigs; intermediate idler gears in multi-stage reduction gearboxes for CNC axis drives; and replacement transmission gears in small agricultural or workshop machinery where module 1.0 is the standard pitch. The consistent involute tooth profile ensures smooth meshing with any other module 1.0 mating gear.
Machined from #45 carbon steel for a reliable combination of tensile strength and wear resistance suited to moderate-load drive applications.
Standard 1.0 module pitch with a 20° pressure angle involute profile ensures smooth, low-noise meshing with any compatible 1M mating gear.
A single product family covering 12 to 140 teeth lets you dial in the exact gear ratio your drive system requires without sourcing from multiple suppliers.
Available in 1-piece, 2-piece, or 5-piece packs so you can order a single replacement or stock spares for ongoing projects at a lower per-unit cost.
Pitch diameter = tooth count × module (1.0 mm), making gear ratio and center distance calculations straightforward for any pairing in this range.
Engineered for DC motor pinion drives, multi-stage reduction gearboxes, and replacement transmission gears in module 1.0 standard machinery.
| Module (Pitch) | 1.0 mm |
|---|---|
| Pressure Angle | 20° |
| Material | #45 Carbon Steel |
| Tooth Count Range | 12T – 140T (see variant options) |
| Pitch Diameter | Tooth count × 1.0 mm (e.g., 20T = 20 mm / 0.79 in) |
| Bore Diameter | See variant options |
| Hub Length | See variant options |
| Face Width | See variant options |
| Surface Finish | See variant options |
| Packing Quantity | 1 Pcs / 2 Pcs / 5 Pcs |
Determine your required gear ratio first: divide the driver tooth count by the driven tooth count to get the ratio. For example, pairing a 12T pinion with a 60T gear gives a 5:1 reduction. Then confirm the resulting center distance (sum of both pitch radii) fits your housing. Pitch radius = (tooth count × 1.0 mm) / 2.
Yes. Module 1.0 is an internationally standardized pitch. Any two gears sharing the same module and pressure angle (20°) will mesh correctly regardless of brand, provided the bore and shaft dimensions are compatible.
#45 carbon steel has a tensile strength of approximately 600–800 MPa in its normalized state. For light-to-moderate loads typical of robotics, small CNC axes, and hobby machinery, this material is well-suited. For heavy industrial loads or continuous high-torque applications, consider heat-treated or alloy steel alternatives.
#45 carbon steel is not inherently corrosion-resistant. For environments with moisture or mild chemicals, apply a light machine oil or grease to the tooth faces and bore. For outdoor or wet environments, consider stainless steel or plastic gears instead.
Center distance = (Tooth count of Gear 1 + Tooth count of Gear 2) × Module / 2. For a 20T and 40T pair with Module 1.0: (20 + 40) × 1.0 / 2 = 30 mm. This is the shaft-to-shaft distance required for proper meshing without backlash issues.
Yes, provided the bore diameter matches your motor shaft diameter. Check the bore specification for your selected tooth count variant. If the bore is slightly larger than your shaft, a set screw or keyway arrangement is typically used to secure the gear. Contact us to confirm bore dimensions before ordering if you have a specific shaft size.
All three packing options ship the same gear at the same tooth count. The 2-piece and 5-piece packs offer a lower per-unit cost and are useful when you need spares, are building multiple identical assemblies, or want to stock replacements for ongoing maintenance.
